21+7k=5(1+4k)+3k

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Solution for 21+7k=5(1+4k)+3k equation: 



21+7k=5(1+4k)+3k

We move all terms to the left:

21+7k-(5(1+4k)+3k)=0

We add all the numbers together, and all the variables

7k-(5(4k+1)+3k)+21=0



We calculate terms in parentheses: -(5(4k+1)+3k), so:

5(4k+1)+3k

We add all the numbers together, and all the variables

3k+5(4k+1)

We multiply parentheses

3k+20k+5

We add all the numbers together, and all the variables

23k+5

Back to the equation:

-(23k+5)



We get rid of parentheses

7k-23k-5+21=0

We add all the numbers together, and all the variables

-16k+16=0

We move all terms containing k to the left, all other terms to the right

-16k=-16

k=-16/-16

k=1

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